Listing Months Between Two Dates

In various applications, it becomes necessary to list or iterate through months within a specified date range. To accomplish this, we present two solutions in PHP, catering to different PHP versions.

PHP 5.3 and Later

$start = new DateTime('2010-12-02');
$start->modify('first day of this month');
$end = new DateTime('2012-05-06');
$end->modify('first day of next month');
$interval = DateInterval::createFromDateString('1 month');
$period = new DatePeriod($start, $interval, $end);

foreach ($period as $dt) {
    echo $dt->format("Y-m") . "
\n";
}

PHP 5.4 or Newer

$start = (new DateTime('2010-12-02'))->modify('first day of this month');
$end = (new DateTime('2012-05-06'))->modify('first day of next month');
$interval = DateInterval::createFromDateString('1 month');
$period = new DatePeriod($start, $interval, $end);

foreach ($period as $dt) {
    echo $dt->format("Y-m") . "
\n";
}

Note that modifying the start and end dates to the first day of each month ensures a complete listing of the desired months, preventing cases where February might be skipped if the current day is higher than its last day.